Year	Cubic Meters
1990	20758300
1991	20390500
1992	20674400
1993	21910400
1994	23252500
1995	24302500
1996	24357900
1997	27034000
1998	28050000
1999	27667000
2000	31181000
2001	31087000
2002	29712000
2003	31604000
2004	31933000
2005	31933000
2006	31777000
2007	32264000
2008	33269000
2009	30316000
2010	30431000
2011	31291000